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Still Having CW TX Dropout on my 6400M with v. 3.3.29

Wasn't the new firmware supposed to fix the longstanding problem with CW transmit dropout? I am still having this problem. My sense is that it is happening less often now than before the upgrade, but still often enough to be very annoying. FlexRadio, when are you going to fix this problem once and for all?



  • Pete La
    Pete La Member ✭✭

    Flex Radio is too busy making money elsewhere. They no longer apply the resources to amateur radio like they used to. They take way too long to fix exsiting problems and do virtually nothing to add new features to the radio (the new software = new radio pitch is a scam). Don't get me wrong, Flex Radios are very good and are hard to beat for remotability,, but the company is not living up to its hype and there is a lot of room for improvement in the software. I just don't think they really care about the ham community when they are making so much money off the government. I had a choice betwee the IC-7610, FTdx-101D and the Flex 6400M and I wish I had gone with the Yaesu. Pete K1OYQ

  • Ted S
    Ted S Member ✭✭


    I am using a Flex 6400, non M, still on 3.2.39. I run 90% CW, about 200 Qs per week. I have tried to replicate this bug using all kinds of methods. I even hooked up an external HP pulse generator to generate all sorts of keying waveforms with simulated key bounce, etc all under controlled conditions. I use a multi channel DSO to monitor both the RF waveform and the keying waveform. I have never been able to get the radio to reproduce this fault, seems like a real mystery.

    The CW bug I do experience is that the RF waveform starts to studder and drop elements if it is powered up continuously for about 72 hours. I can reproduce this bug every time. According to the release notes 3.3.39 is supposed to fix that bug but I am waiting on a backup SD card before I complete that upgrade.

  • schacterfoto
    schacterfoto Member ✭✭

    Thanks Ted. I am 100% CW and my level of activity is similar to yours. The dropout occurs at least once in about 50% of QSOs.

  • K1ESE
    K1ESE Member ✭✭

    The frequency of the dropouts seems to be connected to the Delay setting on the P/CW settings panel of SmartSDR. If I set it at 400 I easily get the transmitter to stop sending for a short period. During that period anything I have keyed has been lost or "dropped out". Shorter Delay settings may make the dropout shorter so that only a letter or less is dropped.

    I have a Help Desk ticket in and am hoping for a quick solution.


  • Pete La
    Pete La Member ✭✭

    I'm now getting lots of dropouts on SSB and on FT-8 since installing the new software version 3.3.29. I have a 6400M. I can't figure out why I'm having all these dropouts. On SSB the transmit will dropout between words as I am talking. On FT-8 it sometimes fails to transmit when I double click on a new contact, but it will transmit the second time. I've tried hard reset with no luck. I'm not impressed with the 3.3.29 update. I seem to be having issues that weren't there before.

  • Lasse SM5GLC
    Lasse SM5GLC Member ✭✭
    edited May 12

    Setting shorter transmitter hang-time was the previous solution. As the transmitter power magically turned to zero, a cycle over to RX and then back to transmit would bring back the transmitted power. Having very short hang time would allow RX in between word or even letters i.e. assuring no more than letter or word would be lost.

    Sounds like the root cause is still there :( BTW 2.4.10 still works great, only missing the remote stuff, which can be fixed using VPN. Just say'n :)

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    @Pete La If you can do an A / B test by going back to 3.2 and then back to 3.3 (reset the radio each time) and you get drop outs, that would be a good data point.

    Open a helpdesk ticket so that it gets tracked correctly please. Not everyone is seeing this, so it helps to understand why you are.


  • Ted S
    Ted S Member ✭✭

    Follow up to my first post, Although I normally run QSK, 0 delay, I recall setting some long delays up to a second and still not being able to reproduce. My 6400 has a Jan 2021 SN. Perhaps the issue is dependent on HW and revision.

    Ted, WR4T

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